Fairy Duster exhibits an intriguing affinity with the Southeast direction, a placement theoretically enhancing prosperity and wealth. This association derives from the plant’s lush green shade, harmonious with Wood elements dominant in the Southeast. Still, perceptions of Feng Shui vary greatly, underscoring the need for personalized consultation.

The marsh-mallow exhibits substantial Feng Shui potential, particularly when placed in a west-facing location. It is believed the plant's soothing and healing attributes complement the Metal element predominant in the West, thus promoting harmony and balance. Please consider personal experiences and instincts when applying these principles.

The brasilicactus haselbergii is usually seen as a beneficial addition to spaces that face Northeast. This direction is associated with spiritual growth and inner knowledge in Feng Shui, characteristics that mirror this cactus' symbolism of endurance, strength and survival. The exact patterns of energy a brasilicactus haselbergii might influence are rightly considered subjective and open to personal interpretation.

The hardy begonia harmonizes impeccably with the energy of the West direction. In Feng Shui, west is correlated with the metal element, suggestive of refinement and precision. As a hardy, patient plant, hardy begonia mirrors these qualities, making it an apt addition for west-facing spaces. However, individual's experiences can widely vary based on their unique situations and interpretations.

From a Feng Shui perspective, the swallow tail is considered auspicious, potentially creating positive Chi flow when placed appropriately. Its dynamic, unfolding foliage complements the Wood element predominantly found in East-facing sectors. This, along with its layered, butterfly-like leaves, encourages a harmonious balance between growth (Wood) and transformation (Water), an interplay deeply embedded within Feng Shui principles.

The beggarticks holds a promising bias towards the East-facing direction. This could be reasoned with its bright white flowers that mirror the rising sun, a symbolism rooted in renewal and fresh beginnings in Feng Shui. Nonetheless, it is essential to remember that Feng Shui, like the nature of beggarticks, is personal and subject to interpretation.

The overcup oak resonates favorably with the energetic realm of Feng Shui. Its sturdy trunk symbolizes strength and resilience, making it a good harmonizer in Southeast-facing spaces, traditionally associated with wealth and prosperity. However, individual experiences with Feng Shui may differ, reflecting the complex interplay of energies in one's environment.

The grand Fir aligns well with Feng Shui principles when placed in the East. Its evergreen nature symbolizes enduring energy and growth, which harmonizes with the Wood element typical of the East. Remember, though, Feng Shui is as much personal as universal – what works auspiciously for one may not necessarily work for all.